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Bathroom wet hand drying remote control circuit

Source: InternetPublisher:司马缸砸光 Keywords: Remote control circuit BSP relay components Updated: 2020/12/06

50. Bathroom wet hand drying<strong>Remote control circuit</strong>.gif

When you wash your hands and dry them in the bathroom, do you know how it works? This section introduces the remote control circuit of the dryer for readers' reference. t
    (1) Working principle circuit is shown in the figure. The photoelectric sensor GT is internally composed of transmitting and receiving tubes. In an unmanned toilet,
the pulse light emitted by the transmitter tube in the photoelectric sensor GT is reflected back to the receiving tube of the GT because there is no moving object (hand). The GT output stage (black line) shows a low level
, the switching transistor VT is cut off, and the relay k does not operate. The heating wire and hair fan do not work, and the entire circuit is in standby mode.
    When someone is drying their hands, the hand close to the photoelectric sensor reflects the impulse light emitted by the GT transmitting tube to the receiving tube in the GT. The sensor internally
determines that the GT output stage (black line) is high level, and the switching transistor VT is saturated and turned on. , the relay J acts, the normally open contact k of the relay closes, and
the control main circuit is turned on. The heat emitted by the electric heating wire is blown out by the electric fan M to dry the wet hands. After the hands leave the dryer, the circuit returns to the standby
state.
    (2) Component selection GT selects the built-in amplifier HPA type HPAR23 photoelectric sensor produced by Honeywell Company, and the relay
selects the JQX-4F type. The fan can be the fan on the refrigerator. The selection of other components is shown in Figure 18-50, and there are no special requirements.
    (3) Production and debugging. During production, the yellow and red wires in the output line of the photoelectric sensor are disconnected and do not need to be used. The transistors and other components are directly welded on the relay
. This circuit has a simple structure. As long as the components are selected correctly and the welding is correct, it can work normally without debugging. '
    (4) Analysis For the circuit shown in Figure 18-50, if the coil current of the relay KD is very small, or the voltage of the electrical equipment is very low and
the current is very small, then it can be directly connected in series with the reed switch, without to other components . Reed switches generally have small contact capacity: when controlling large-capacity
loads, transistors, relays , contactors or thyristors must be used for voltage-current or power amplification. Since the voltage required by the thyristor control electrode is very low and the current is very small, it is a better solution
to connect the reed switch to the control electrode circuit of the thyristor and the electrical equipment to the main circuit of the thyristor .



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